Jar-wrench.



J. NELSON.

JAR WRENCH.

APPLICATION FILED my 11, 1900.

WITNESSES: v IINVENTOR Patehted Dec. 29, 1908.

. lzenqpfthe United States, residingat Bay No. 907,857. t

. Michigan, have invented certain new and ido hereby declare the following to be a full,

such as will enable others skilled in the art to plying screw tops or covers to and removing .siorrpf a v yielding one-piece gripping j aw tire circmnfcrence thereof.

torendcr them sanitary and thisporcclain rmrrnn gBeit known that 1, JOHN Nnnsos, a citil .City;' in the county of Bay "and State of useful improvements in J ar-W rench'es and clear, and exact descriptionuof the invention,

which] it appertains to make and use the same .My invention relates to jar wrenches for apthernfrom jars or other receptacles. oOne ob ect of my invention is the prov1-.

which will encircle the cover ortop and bring an even pressure to bear throughout the en- Many screw tops are lined with porcelain will crack and peel off if pressureis brought to hear only upon a portion of the circumference. 'l he reason for this is that. the cove are stamped from light sheet metal and pre sure upon a portion orily of "the peripheries thereof, tends to squeeze the walls together and the metal is forced or bulges out at that point where there is no pressure. My inven tion completely encircles the cover and prevents this crowding out or bulging.

Another object of my invention is to provide a jar Wrench which may be applied to any of the different sizes ofcovers now on the market and which will conform exactly to the contours thereof, the Wrench closely fitting and having a complete peripheral contact therewith.

To these ends therefore,.my invention consists in certain novel features and combinations such as will be described. hereinafter and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a top plan view of my invention and Fig. 2

is a )erspective View thereof.

The invention consists solely of a wrench body consisting of a one-piece split annulus, the ends of which terminate conveniently in handles normally diverging from each other, i all of which is preferably stamped from a single sheet of resilient or ductile metal and an adjustable link connecting the handles of the. wrench and cooperating v with the gripping member.

More particularly my invention consists of an open annulus (1) constituting a part of Specificationof Letters Patent.

Application filed May 11, 1908. Serial No. Q32,'l.90.'

,the gripping jaw or head.

' a stud (6) carried by the handle (2).

srnrns PATENT ora ion. 1 \roi1nustsmci cmcmc s I JAR-WRENCH.

Patented. Dec. 29, 19025.

Handles (2), (2), project from the annulus and the outer edges of the handles'are flanged as at (3) to aii'ord a broad bearing surface for the hand 'of the operator."

In orderto br dge the openmg 1n the annulus,- I provide a link (4), one end of which is pivotally secured to the handle (2). 'l he free end of the link overlies the opposite handle (2) an'd is slotted as at(5) to receive permits the handles to move relative to each other to expandand contract the annulus, the link autmnaticaily adjusting itself to complete the varying curvatures of the annulus vvhen cxjflrndcd or contracted. The link. is longer than the opening in the annulus. By this means the gripping annulus adjusts itself to the contour ofany cover to which it is applic ,l, the full circle formed by [the annulus and the link operating to on P gage the covcrand forming the complete gripping j aw, i

The inner face of the link is curved to conform to the curve of the inner periphery of the gripping jaw and the slot. (5) is so arranged relative to the curved inner face of the link that movement of the handles toward each other will hold the curved face of the link tightly against the cover.

By the combination of the curved link completing the annular gripping jaw and adjusting itself automatically to the expansion and contraction of the jaw, l have produced an article which will press tightly and evenly throughout the entire circumference of the top or cover. This avoids cracking or breaking the lining of the cover and also facilitates its placing on or removal from the covers.

Owing to the resiliency of the wrench it can be expanded or contracted to fit a wid range of sizes of covers.

The curved face of the pivoted link ac commodatcs itself to the varying arcs of the covers so that the cover is firmly gripped and completely encircled, every part of the gripping face of the wrenchengaging with the surface of the cover, and forming a complete peripheral contact. The arrangement of the slot (5) at an angle to the curved face of the link causes the curved face to conform to the arc of curvature of the gripping surface of the annulus when'thc latter is expanded or contracted. The overlapping extension of. the slotted link permits the This latter to accommodate itself to the expansion or contraction of the annulus.

Having thus lully disclosed my invention, what I claim as new is:

1. An adjustable wrench comprising an open annulus, handles projecting therelrom, a link pivotally secured to one of the handles and overlapping the opposite handlefa slot in the link and a stud carried by thelast named handle and received in the slot, the inner face of the link being curved and com-- pleting the inner periphery of the annulus.

2; A'tool for covers comprising an open annulus adjustable to covers of varying sizes,

handles projecting from the annulus, a link pivotally secured to one handle and sliuingly ,connected to the opposite handle, the link bridging the opening in the annulus and being curved to cooperate with the annulus at all times to form a complete circular gripping jaw.

3. An adjustable wrench comprising an open annulus, handles projecting theretrom, and a link pivotally secured to one handle and sliringly connected to the opposite han dle, the link being longer than the opening in the annulus and having a curvedinner face adjustable to the'varyrng curvatures of the annulus, and cooperating thereuit h to form a circular gripping jaw.

4. A l'ruit jar wrench comprising an 0 en annulus, handles projecting therefrom, a i k pivotally secured to one handle, the inner edge ol'the link being curved to conform to the curvature of the inner periphery of the annulus and bridging the opening in the annulus the free end of the link overlying the opposite handle and having a slot extending at an angle to the curved edge of the link,

and a stud carried by the hanole and received A in the slot.

5; A wrench comprising an open one-piece annulus, handles secured to and projecting from opposite sides of the opening in the annulus, the handles being independent of each other, a link pivotally secured to one of the handles, and slidingly secured to the opposite hanule, the link Lnicging the opening in the annulus and having its inner face curved to engage and conform to the curvature of the article operated upon u hereby to complete the circular gripping surface ol the annulus.

6. A wrench comprising an openone-piecc annulus, handles projecting from opposite sides of the opening in the annulus, and a member pivotally secured to one handle, and slicingly secured to the other handle, the member bri, ging the opening in the annulus, one edge ol the member being curved and automatically cooperating uith the inner periphery of the annulus to term a complete circular gripping jaw conforming to and exerting an equal pressure throughout the entire circumference of the work.

In testimony whereof, I allix my signature in presence of two u itnesses.

JOHN NELSON.

Witnesses: I

RALPH S. WVARFIELD, ROY WALLIS. 

